September weather forecast
Freeport, PA

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Weather in September

September, the first month of the autumn in Freeport, is still a warm month, with an average temperature varying between 54.3°F (12.4°C) and 74.7°F (23.7°C).

Temperature

As September arrives, Freeport's weather displays a minor decrease in high-temperatures, transitioning from August's 81°F (27.2°C) to a still warm 74.7°F (23.7°C). During the month of September, the nighttime temperature falls to an average of 54.3°F (12.4°C).

Humidity

The average relative humidity in September is 79%.

Rainfall

In Freeport, in September, it is raining for 11.3 days, with typically 1.34" (34mm) of accumulated precipitation. Throughout the year, there are 147.1 rainfall days, and 18.54" (471mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall.

Daylight

In Freeport, the average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 6:46 am and sunset at 7:50 pm. On the last day of September, sunrise is at 7:14 am and sunset at 7:01 pm EDT.

Sunshine

In Freeport, the average sunshine in September is 8.5h.

UV index

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: An average UV index of 4 in September transforms into this advice:
Make use of precautions - It is urged to ward off sun damage. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Always opt for UVA and UVB-resistant sunglasses on radiant days.

Frequently asked questions

What are the temperatures in September?

An average high-temperature, in September, in Freeport, is 74.7°F (23.7°C) and the average low-temperature is 54.3°F (12.4°C). In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines relative humidity and air temperature, is evaluated at 86°F (30°C).

What is the average humidity in September?

In September, the average relative humidity is 79%.

How much does it rain in September?

In Freeport, in September, during 11.3 rainfall days, 1.34" (34mm) of precipitation is typically accumulated.

When it does not snow?

In Freeport, snow does not fall in June through September.

Does it snow in September?

In Freeport, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September?

In September, the average day length in Freeport is 12h and 27min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:46 am and sunset at 7:50 pm. On the last day of the month, in Freeport, sunrise is at 7:14 am and sunset at 7:01 pm EDT.

How long on average sun shines in September?

The average sunshine duration in September in Freeport, Pennsylvania, is 8.5h.

What is the UV index reading in September?

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Freeport, PA

Average temperature in September - Freeport, PA
  • Average high temperature in September: 74.7°F

The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (32.5°F).

  • Average low temperature in September: 54.3°F

The month with the highest average low temperature is July (60.8°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

Average pressure in September
Freeport, PA

Average pressure in September - Freeport, PA
  • Average pressure in September: 30.06"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in September
Freeport, PA

Average wind speed in September - Freeport, PA
  • Average wind speed in September: 5.3mph

The windiest month (with the highest average wind speed) is January (8.2mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

Average humidity in September
Freeport, PA

Average humidity in September - Freeport, PA
  • Average humidity in September: 79%

The month with the highest relative humidity is February (86%).
The months with the lowest relative humidity are April, July and August (77%).

Average rainfall in September
Freeport, PA

Average rainfall in September - Freeport, PA
  • Average rainfall in September: 1.34"

The wettest month (with the highest rainfall) is May (2.13").
The driest month (with the least rainfall) is November (1.02").

Average rainfall days in September
Freeport, PA

Average rainfall days in September - Freeport, PA
  • Average rainfall days in September: 11.3 days

The month with the highest number of rainy days is May (17.6 days).
The months with the least rainy days are January and February (7.8 days).

Average snowfall in September
Freeport, PA

Average snowfall in September - Freeport, PA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (2.8").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Freeport, PA

Average snowfall days in September - Freeport, PA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (12.9 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Freeport, PA

Average daylight in September / Average sunshine in September - Freeport, PA
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 8h and 3min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).

Average sunshine days in September
Freeport, PA

Average sunshine days in September - Freeport, PA
  • Average sunshine days in September: 16.1 days

The month with the most sunshine days is November (18.1 days).
The month with the least sunshine days is May (10 days).

Average UV index in September
Freeport, PA

Average UV index in September - Freeport, PA
  • Average UV index in September: 4

The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in September
Freeport, PA

Average cloud cover in September - Freeport, PA
  • Average cloud cover in September: 39

The month with the most cloud cover is January (Cloud cover 71).
The month with the least cloud cover is August (Cloud cover 35).

Average visibility in September
Freeport, PA

Average visibility in September - Freeport, PA
  • Average visibility in September: 5mi

The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (5mi).

Freeport, Pennsylvania, USA

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